Example usage for java.util.concurrent.atomic AtomicLong compareAndSet

Introduction

In this page you can find the example usage for java.util.concurrent.atomic AtomicLong compareAndSet.

Prototype

public final boolean compareAndSet(long expectedValue, long newValue) 

Source Link

Document

Atomically sets the value to newValue if the current value == expectedValue , with memory effects as specified by VarHandle#compareAndSet .

Usage

From source file:Main.java

public static void main(String[] argv) {
    AtomicLong nextId = new AtomicLong();

    nextId.compareAndSet(122L, 123L);
    System.out.println(nextId.getAndIncrement());

}

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From source file:Main.java

public static long getAndAddRequest(AtomicLong atomiclong, long l) {
    long l1;//from w ww.  j  a  v a 2s  .  com
    do {
        l1 = atomiclong.get();
    } while (!atomiclong.compareAndSet(l1, addCap(l1, l)));
    return l1;
}

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From source file:Main.java

static <T> long getAndAddRequest(AtomicLong paramAtomicLong, long paramLong) {
    long l1;/*from ww  w. ja  va 2s.  c om*/
    long l2;
    do {
        l1 = paramAtomicLong.get();
        l2 = l1 + paramLong;
        if (l2 < 0L)
            l2 = 9223372036854775807L;
    } while (!paramAtomicLong.compareAndSet(l1, l2));
    return l1;
}

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From source file:Main.java

public static long getAndAddRequest(AtomicLong requested, long n) {
    long current;
    long next;/*from  w w w  .j av  a 2s .c o  m*/
    do {
        current = requested.get();
        next = current + n;
        if (next < 0) {
            next = Long.MAX_VALUE;
        }
    } while (!requested.compareAndSet(current, next));
    return current;
}

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From source file:com.alibaba.rocketmq.example.benchmark.Consumer.java

public static void compareAndSetMax(final AtomicLong target, final long value) {
    long prev = target.get();
    while (value > prev) {
        boolean updated = target.compareAndSet(prev, value);
        if (updated)
            break;

        prev = target.get();/*ww w  .  j  av a  2 s  .  c om*/
    }
}

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From source file:Main.java

/**
 * Adds {@code n} to {@code requested} and returns the value prior to addition once the
 * addition is successful (uses CAS semantics). If overflows then sets
 * {@code requested} field to {@code Long.MAX_VALUE}.
 * /*from  w w  w  . j  ava2s .c om*/
 * @param requested
 *            atomic long that should be updated
 * @param n
 *            the number of requests to add to the requested count
 * @return requested value just prior to successful addition
 */
public static long getAndAddRequest(AtomicLong requested, long n) {
    // add n to field but check for overflow
    while (true) {
        long current = requested.get();
        long next = addCap(current, n);
        if (requested.compareAndSet(current, next)) {
            return current;
        }
    }
}

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From source file:Main.java

/**
 * Atomically subtracts a value from the requested amount unless it's at Long.MAX_VALUE.
 * @param requested the requested amount holder
 * @param n the value to subtract from the requested amount, has to be positive (not verified)
 * @return the new requested amount/*from w w  w  . j a  va  2s  . c om*/
 * @throws IllegalStateException if n is greater than the current requested amount, which
 * indicates a bug in the request accounting logic
 */
public static long produced(AtomicLong requested, long n) {
    for (;;) {
        long current = requested.get();
        if (current == Long.MAX_VALUE) {
            return Long.MAX_VALUE;
        }
        long next = current - n;
        if (next < 0L) {
            throw new IllegalStateException("More produced than requested: " + next);
        }
        if (requested.compareAndSet(current, next)) {
            return next;
        }
    }
}

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From source file:com.icloud.framework.core.util.FBUtilities.java

public static void atomicSetMax(AtomicLong atomic, long i) {
    while (true) {
        long j = atomic.get();
        if (j >= i || atomic.compareAndSet(j, i))
            break;
    }//from   ww w .jav  a  2 s .  co m
}

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From source file:com.alibaba.rocketmq.common.MixAll.java

public static boolean compareAndIncreaseOnly(final AtomicLong target, final long value) {
    long prev = target.get();
    while (value > prev) {
        boolean updated = target.compareAndSet(prev, value);
        if (updated)
            return true;

        prev = target.get();/* ww w .  j a  v a 2 s.co  m*/
    }

    return false;
}

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From source file:com.nextdoor.bender.handler.BaseHandler.java

private static void updateOldest(AtomicLong max, long time) {
    while (true) {
        long curMax = max.get();

        /*//from w w  w. ja v a  2 s.c  om
         * With time smaller value is older
         */
        if (curMax <= time) {
            return;
        }

        if (max.compareAndSet(curMax, time)) {
            return;
        }
    }
}

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